Diagnostic Instructions
Circuit/System Description
The tire pressure monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. The module receives and translates the data contained in the tire pressure sensor RF transmissions into sensor presence, sensor
mode, and tire pressure.
The receiver module receives a radio frequency (RF) transmission from each tire pressure sensor. Each sensor RF transmission contains its own unique identification (ID) code that must be learned into the module memory. Once all 4 IDs have been learned,
the module continuously compares IDs received in transmission to its learned IDs to determine if all 4 sensors are present.
If the control module detects a low tire pressure condition or a malfunction in the system, it will illuminate the tire pressure monitor indicator.
Diagnostic Aids
| • | Some aftermarket wheel valve stem holes are located further from the wheel rim than original equipment wheels. When using the TPM special tool to activate a sensor, ensure the tool antenna is no further than 15 cm (6 in) from
the sensor and is aiming upward. |
| • | Aftermarket wheel value stem locations can cause a sensor to not function correctly. |
| • | A sensor may have been damaged due to a previous wheel/tire service or flat tire event. |
| • | The use of tire sealants can obstruct the sensor pressure sensing port and cause inaccurate tire pressure readings. If this condition is verified, remove the sealer from the tire and replace the sensor. Refer to
Tire Pressure Indicator Sensor Replacement
. |
| • | Occasionally sensor transmissions are not received by the module due to vehicle level RF interference from items such as but not limited to aftermarket ignition systems, DVD players, CB radios, or metallic type window tinting. |
| • | The sensor activation procedure may have to be repeated up to 3 times before determining a sensor is malfunctioning. In the event a particular sensor's information is displayed on the special tool upon activation but the horn does not chirp,
it may be necessary to rotate the wheel valve stem to a different position due to the RF signal is being blocked by another component. |
| • | Occasionally sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed or stray sensor transmissions have been received from other vehicles . Always learn the sensors to ensure the DTC set is
for that actual physical corner of the vehicle. Refer to
Tire Pressure Sensor Learn
. |
Reference Information
Description and Operation
Tire Pressure Monitor Description and Operation
Schematic Reference
Tire Pressure Monitoring System Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Scan Tool Reference
Control Module References
for Scan Tool Information
Circuit/System Verification
- With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel lamps ON. Verify tire pressure monitor indicator icon turns ON.
| ⇒ | If the icon does not turn ON, replace the IPC. |
- Disconnect the harness connector at the Tire Pressure Control Module.
- Disconnect the harness connector at the IPC.
- Test for less than 1 ohm of resistance between the warning light control circuit terminal 5 and terminal 7.
| ⇒ | If greater than the specified value, test the warning light control circuit for an open/high resistance. |
- Test for infinite resistance between the warning light control circuit terminal 5 and ground.
| ⇒ | If less than the specified value, test the warning light control circuit for a short to ground. If circuit tests normal, replace the tire pressure control module. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
